- The subject has concomitant diseases in which the use of anticholinergic drugs is contraindicated, e.g. urinary retention, bladder obstruction, gastric retention and other severe decreased gastrointestinal motility conditions, uncontrolled narrow-angle glaucoma, myasthenia gravis, severe hepatic impairment (Child Pugh C), severe ulcerative colitis, toxic megacolon, and patients who are at risk for these conditions.